The word truth and its cognates occur frequently in the New Testament, in fact 183 times. As noted above, the connotation of “faithfulness,” so common in the Old Testament, recedes into the background. In some cases the word true is actually linked with the word pistos “faithful” (Rev. 3:14; 19:11; 21:5; 22:6). The emphasis here is that the witness is speaking the truth and is worthy of confidence.

 D. A. Carson and John D. Woodbridge, Scripture and Truth (Grand Rapids, MI: Baker Book House, 1992), 293.